ASoC: Atmel: ClassD: supports mono audio

Modify the code to support mono audio.

Signed-off-by: Songjun Wu <songjun.wu@atmel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/atmel/atmel-classd.c b/sound/soc/atmel/atmel-classd.c
index 8276675730ef1252483b4a5e1d2b649bf71dfe1e..dca614177fef8370e54f3295419f5530b7316e2d 100644 (file)
--- a/sound/soc/atmel/atmel-classd.c
+++ b/sound/soc/atmel/atmel-classd.c
@@ -106,7 +106,7 @@ static const struct snd_pcm_hardware atmel_classd_hw = {
        .rates                  = ATMEL_CLASSD_RATES,
        .rate_min               = 8000,
        .rate_max               = 96000,
-       .channels_min           = 2,
+       .channels_min           = 1,
        .channels_max           = 2,
        .buffer_bytes_max       = 64 * 1024,
        .period_bytes_min       = 256,
@@ -145,7 +145,7 @@ static const struct snd_soc_dai_ops atmel_classd_cpu_dai_ops = {
 
 static struct snd_soc_dai_driver atmel_classd_cpu_dai = {
        .playback = {
-               .channels_min   = 2,
+               .channels_min   = 1,
                .channels_max   = 2,
                .rates          = ATMEL_CLASSD_RATES,
                .formats        = SNDRV_PCM_FMTBIT_S16_LE,},
@@ -171,9 +171,13 @@ atmel_classd_platform_configure_dma(struct snd_pcm_substream *substream,
                return -EINVAL;
        }
 
+       if (params_channels(params) == 1)
+               slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+       else
+               slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+
        slave_config->direction         = DMA_MEM_TO_DEV;
        slave_config->dst_addr          = dd->phy_base + CLASSD_THR;
-       slave_config->dst_addr_width    = DMA_SLAVE_BUSWIDTH_4_BYTES;
        slave_config->dst_maxburst      = 1;
        slave_config->src_maxburst      = 1;
        slave_config->device_fc         = false;
@@ -486,7 +490,7 @@ static struct snd_soc_dai_driver atmel_classd_codec_dai = {
        .name = ATMEL_CLASSD_CODEC_DAI_NAME,
        .playback = {
                .stream_name    = "Playback",
-               .channels_min   = 2,
+               .channels_min   = 1,
                .channels_max   = 2,
                .rates          = ATMEL_CLASSD_RATES,
                .formats        = SNDRV_PCM_FMTBIT_S16_LE,